Development of a Component Head Injury Criteria (HIC ... - FAA

Head C.G. Resultant Acceleration (g's)
140
130
120
110
100
90
80
70
60
50
40
30
20
10
Mode-II Validation Test 01057-71
(Aluminum 2024 - T3 Bulkhead)
Sled, t1=3.3191 sec
Component, t1=3.3199 sec
Sled Test (96288-16)
Component Test (01057-71)
Sled, t1
Sled, t2
Component, t1
Component, t2
0
3.3 3.31 3.32 3.33 3.34 3.35 3.36 3.37
Time (sec)
Component, t2=3.3551 sec
Sled, t2=3.3572 sec
Head C.G. Resultant Acceleration (g's)
140
130
120
110
100
90
80
70
60
50
40
30
20
10
Mode-II Validation Test 01057-72
(Aluminum 2024-T3 Bulkhead)
Sled, t1=3.3191 sec
Component, t1=3.3200 sec
Sled Test (96288-16)
Component Test (01057-72)
Sled, t1
Sled, t2
Component, t1
Component, t2
0
3.3 3.31 3.32 3.33 3.34 3.35 3.36 3.37
Time (sec)
Component, t2=3.3569 sec
Sled, t2=3.3572 sec
Figure 13. Evaluation of Resultant Acceleration for NHCT Tests
01057-71 and 72 With FSST 96288-16
The repeatability plots of NHCT test 01057-71 and 72 are shown in figure 14. A comparison of
NHCT results with an FSST is listed in table 4.
Head C.G. Resultant Acceleration (g's)
140
130
120
110
100
90
80
70
60
50
40
30
20
10
Mode-II Repeatability Test# 01057-71 & 72
(Aluminum 2024 - T3 Bulkhead)
Component Test# 01057-71
Component Test# 01057-72
0
3.3 3.31 3.32 3.33 3.34 3.35 3.36 3.37
Time (sec)
Figure 14. Repeatability of NHCT Tests 01057-71 and 72
Table 4. Comparison of NHCT 01057-71 and 72 With FSST 6288-16
Parameter
FSST
96288-16
NHCT Test
01057-71
NHCT Test
01057-72
Head impact angle (deg) 44.0 44.0 45.0
Head impact velocity (ft/sec) 38.9 39.5 40.4
HIC 586.0 659.0 615.0
HIC window (ms) 38.1 35.2 36.9
Head c.g. peak acceleration (g’s) 129.6 129.7 125.2
Head c.g. avg. acceleration (g’s) 47.4 51.1 36.9
12